TargetLibraryInfo.h revision 419454ad3720b8cf4613d9e790669c8beaccd1a4 
1//===-- llvm/Target/TargetLibraryInfo.h - Library information ---*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef LLVM_TARGET_TARGETLIBRARYINFO_H
11#define LLVM_TARGET_TARGETLIBRARYINFO_H
12
13#include "llvm/Pass.h"
14
15namespace llvm {
16  class Triple;
17
18  namespace LibFunc {
19    enum Func {
20      /// void *memset(void *b, int c, size_t len);
21      memset,
22
23      // void *memcpy(void *s1, const void *s2, size_t n);
24      memcpy,
25
26      /// void memset_pattern16(void *b, const void *pattern16, size_t len);
27      memset_pattern16,
28
29      /// int iprintf(const char *format, ...);
30      iprintf,
31
32      /// int siprintf(char *str, const char *format, ...);
33      siprintf,
34
35      NumLibFuncs
36    };
37  }
38
39/// TargetLibraryInfo - This immutable pass captures information about what
40/// library functions are available for the current target, and allows a
41/// frontend to disable optimizations through -fno-builtin etc.
42class TargetLibraryInfo : public ImmutablePass {
43  unsigned char AvailableArray[(LibFunc::NumLibFuncs+7)/8];
44public:
45  static char ID;
46  TargetLibraryInfo();
47  TargetLibraryInfo(const Triple &T);
48
49  /// has - This function is used by optimizations that want to match on or form
50  /// a given library function.
51  bool has(LibFunc::Func F) const {
52    return (AvailableArray[F/8] & (1 << (F&7))) != 0;
53  }
54
55  /// setUnavailable - this can be used by whatever sets up TargetLibraryInfo to
56  /// ban use of specific library functions.
57  void setUnavailable(LibFunc::Func F) {
58    AvailableArray[F/8] &= ~(1 << (F&7));
59  }
60
61  void setAvailable(LibFunc::Func F) {
62    AvailableArray[F/8] |= 1 << (F&7);
63  }
64
65  /// disableAllFunctions - This disables all builtins, which is used for
66  /// options like -fno-builtin.
67  void disableAllFunctions();
68};
69
70} // end namespace llvm
71
72#endif
73